86.

87,

88,

89.

90.

91.

92,

93,

A 40 kVA, 1-phase transformer has an iron loss of 400 W and full load copper loss of 600 W.
Maximum efficiency occurs at a load of :

(ಹ) 17.77 kVA (8) 26.67 kVA (©) 32.66 (५ (D) 37.85 ಸ

Which winding of the transformer has large cross sectional area ?
(A) primary winding (8) secondary winding
(9 high voltage winding (1)) low voltage winding

During short circuit test, iron losses are negligible because :
(A) voltage on secondary side is high (B) voltage applied on primary side is low
(ಲ) current in secondary side is low (D) current in primary side is low

If the input to the primemover of an alternator is constant but the excitation is changed,
then :

(A) reactive power output changed

(8) active power output changed

(9) power factor of the load remains constant
(D) all of the above

For a sine wave oscillator, total phase shift around the loop and magnitude of loop gain must
४९:

(ಗಿ) zero and unity (0) 180° and unity
(C) zero and less than unity (D) 90" ಹಾಣಿ unity

The first column of Routh table contains the following; 1, 2, 4, 3.5, 1. The system is :
(A) unstable (B) stable
(C) marginally stable (D) none of these

The effect of a phase lag network is :

(4) phase margin increased and bandwidth reduced
(B) phase margin and bandwidth increased

(9) phase margin ഒസി bandwidth reduced

(D} phase margin reduced and bandwidth increased

If the bandwidth of a control system is increased, the result will be :

(ക) slower response (B) . faster response
(9 settling time less (D) none of the above
13 117/2014

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